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Net Income (Loss) Per Share (Anti-Dilutive Shares Issuable) (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares issuable (in shares)	11.5	17.6	15.0	17.5
Conversion of Notes
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares issuable (in shares)	0.0	6.2	0.0	6.1
Share purchase options
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares issuable (in shares)	10.3	9.5	13.6	9.4
Restricted Stock and Restricted Share Units (RSUs)
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares issuable (in shares)	0.1	0.7	0.1	0.8
Other issuable shares
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares issuable (in shares)	1.1	1.2	1.3	1.2

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

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+ References

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